How to optimize the performance of the "Config" framework in the Java library

How to optimize the "Config" framework performance in the Java library Summary: When writing the Java application, it is a common approach to use the configuration file to store the settings and parameters of the application.However, in large applications, the configuration file may contain a large amount of key value pairs, which may cause performance decline.This article will introduce some optimization skills to improve the performance of the "Config" framework in the Java class library. 1. Use cache Under normal circumstances, the content of the configuration file will not change during the application of the application.Therefore, the contents of the configuration file can be read to the memory and the cache can be accessed instead of reading from the disk every time you need to read the configuration.This can greatly improve the speed of access configuration files. Below is an example code using a cache access configuration file: public class AppConfig { private static final Map<String, String> configCache = new HashMap<>(); public static String getConfigValue(String key) { if (configCache.containsKey(key)) { return configCache.get(key); } // Read the configuration from the file and put it in the cache String value = readConfigFromFile(key); configCache.put(key, value); return value; } private static String readConfigFromFile(String key) { // Read the value of the specified key from the configuration file // Realize the code omitted } } 2. Avoid repeated parsing configuration files By default, many configuration frameworks resume the entire configuration file every time they need to access the configuration item.This approach may lead to decline in performance.In order to avoid repeatedly analyzing the configuration file, it can be converted to internal data structures when parsing the configuration file for the first time, such as HashMap to quickly access and retrieve. The following is an example code: public class AppConfig { private static final Map<String, String> configMap = new HashMap<>(); static { // Analyze the configuration file and store the configuration item into configmap parseConfigFile(); } public static String getConfigValue(String key) { return configMap.get(key); } private static void parseConfigFile() { // Analyze the configuration file, and store the configuration item into configmap // Realize the code omitted } } 3. Reduce the number of loading of the configuration item If the configuration file contains a large amount of configuration items and only need to access one of the configuration items at a time, you can consider dividing the configuration file into multiple small files and put the relevant configuration items in the same file.In this way, the files of the configuration items that need to be accessed will be loaded, which can reduce the number of loading of the configuration item and improve performance. 4. Reasonable use of cache strategies When the content of the configuration file does need to change, some cache strategies can be used to improve performance.For example, you can set a timing task to check the modification time of the configuration file regularly, and reload the configuration file when there is modification.Or you can listen to the file system event in order to update the configuration in a timely manner when the file changes. 5. Use a more efficient configuration library If you choose to use a third -party configuration library, you need to choose those high performance.Some benchmark tests can be performed to perform performance tests for different configuration libraries, and select libraries with good performance performance. Summary: By using cache, avoid repeatedly analyzed the configuration file, reduce the number of loading of the configuration item, the reasonable use of the cache strategy and the configuration library with good selective performance, it can significantly improve the performance of the "Config" framework in the Java class library , To improve the overall performance of the application. Please note: The above code examples are for reference only, and the specific implementation method may vary from application scenarios.